Evaluate the following integrals: ^ -1 x^2 1+x^4 dx - Vidyadip

Question

Evaluate the following integrals:
$\int\text{x}\frac{\tan^{-1}\text{x}^2}{1+\text{x}^4}\text{ dx}$

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Answer

Let $\text{I}=\int\text{x}\frac{\tan^{-1}\text{x}^2}{1+\text{x}^4}\text{ dx}\ ....(1)$

Let $\tan^{-1}\text{x}^2=\text{t}$ then,

$\text{d}\big(\tan^{-1}\text{x}^2\big)=\text{dt}$

$\Rightarrow\frac{1\times2\text{x}}{1+(\text{x}^2)^2}\text{ dx}=\text{dt}$

$\Rightarrow\frac{1\times\text{x}}{1+\text{x}^4}\text{ dx}=\frac{\text{dt}}{2}$

Putting, $\tan^{-1}\text{x}^2=\text{t}$ and $\frac{\text{x}}{1+\text{x}^4}\text{ dx}=\frac{\text{dt}}{2}$ in equation (1),

we get,

$\text{I}=\int\text{t}\frac{\text{dx}}{2}$

$=\frac{1}{2}\int\text{t dt}$

$=\frac{1}{2}\times\frac{\text{t}^2}{2}+\text{C}$

$\text{I}=\frac{\text{t}^2}{4}+\text{C}$

$=\frac{(\tan^{-1}\text{x}^2)^2}{4}+\text{C}$

$\text{I}=\frac{1}{4}\big(\tan^{-1}\text{x}^2\big)^2+\text{C}$

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